+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-//
-// imx-ssi.c -- ALSA Soc Audio Layer
-//
-// Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
-//
-// This code is based on code copyrighted by Freescale,
-// Liam Girdwood, Javier Martin and probably others.
-//
-// The i.MX SSI core has some nasty limitations in AC97 mode. While most
-// sane processor vendors have a FIFO per AC97 slot, the i.MX has only
-// one FIFO which combines all valid receive slots. We cannot even select
-// which slots we want to receive. The WM9712 with which this driver
-// was developed with always sends GPIO status data in slot 12 which
-// we receive in our (PCM-) data stream. The only chance we have is to
-// manually skip this data in the FIQ handler. With sampling rates different
-// from 48000Hz not every frame has valid receive data, so the ratio
-// between pcm data and GPIO status data changes. Our FIQ handler is not
-// able to handle this, hence this driver only works with 48000Hz sampling
-// rate.
-// Reading and writing AC97 registers is another challenge. The core
-// provides us status bits when the read register is updated with *another*
-// value. When we read the same register two times (and the register still
-// contains the same value) these status bits are not set. We work
-// around this by not polling these bits but only wait a fixed delay.
-
-#include <linux/clk.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/dma-mapping.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-
-#include <sound/core.h>
-#include <sound/initval.h>
-#include <sound/pcm.h>
-#include <sound/pcm_params.h>
-#include <sound/soc.h>
-
-#include <linux/platform_data/asoc-imx-ssi.h>
-
-#include "imx-ssi.h"
-#include "fsl_utils.h"
-
-#define SSI_SACNT_DEFAULT (SSI_SACNT_AC97EN | SSI_SACNT_FV)
-
-/*
- * SSI Network Mode or TDM slots configuration.
- * Should only be called when port is inactive (i.e. SSIEN = 0).
- */
-static int imx_ssi_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai,
- unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width)
-{
- struct imx_ssi *ssi = snd_soc_dai_get_drvdata(cpu_dai);
- u32 sccr;
-
- sccr = readl(ssi->base + SSI_STCCR);
- sccr &= ~SSI_STCCR_DC_MASK;
- sccr |= SSI_STCCR_DC(slots - 1);
- writel(sccr, ssi->base + SSI_STCCR);
-
- sccr = readl(ssi->base + SSI_SRCCR);
- sccr &= ~SSI_STCCR_DC_MASK;
- sccr |= SSI_STCCR_DC(slots - 1);
- writel(sccr, ssi->base + SSI_SRCCR);
-
- writel(~tx_mask, ssi->base + SSI_STMSK);
- writel(~rx_mask, ssi->base + SSI_SRMSK);
-
- return 0;
-}
-
-/*
- * SSI DAI format configuration.
- * Should only be called when port is inactive (i.e. SSIEN = 0).
- */
-static int imx_ssi_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
-{
- struct imx_ssi *ssi = snd_soc_dai_get_drvdata(cpu_dai);
- u32 strcr = 0, scr;
-
- scr = readl(ssi->base + SSI_SCR) & ~(SSI_SCR_SYN | SSI_SCR_NET);
-
- /* DAI mode */
- switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
- case SND_SOC_DAIFMT_I2S:
- /* data on rising edge of bclk, frame low 1clk before data */
- strcr |= SSI_STCR_TXBIT0 | SSI_STCR_TSCKP | SSI_STCR_TFSI |
- SSI_STCR_TEFS;
- scr |= SSI_SCR_NET;
- if (ssi->flags & IMX_SSI_USE_I2S_SLAVE) {
- scr &= ~SSI_I2S_MODE_MASK;
- scr |= SSI_SCR_I2S_MODE_SLAVE;
- }
- break;
- case SND_SOC_DAIFMT_LEFT_J:
- /* data on rising edge of bclk, frame high with data */
- strcr |= SSI_STCR_TXBIT0 | SSI_STCR_TSCKP;
- break;
- case SND_SOC_DAIFMT_DSP_B:
- /* data on rising edge of bclk, frame high with data */
- strcr |= SSI_STCR_TXBIT0 | SSI_STCR_TSCKP | SSI_STCR_TFSL;
- break;
- case SND_SOC_DAIFMT_DSP_A:
- /* data on rising edge of bclk, frame high 1clk before data */
- strcr |= SSI_STCR_TXBIT0 | SSI_STCR_TSCKP | SSI_STCR_TFSL |
- SSI_STCR_TEFS;
- break;
- }
-
- /* DAI clock inversion */
- switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
- case SND_SOC_DAIFMT_IB_IF:
- strcr ^= SSI_STCR_TSCKP | SSI_STCR_TFSI;
- break;
- case SND_SOC_DAIFMT_IB_NF:
- strcr ^= SSI_STCR_TSCKP;
- break;
- case SND_SOC_DAIFMT_NB_IF:
- strcr ^= SSI_STCR_TFSI;
- break;
- case SND_SOC_DAIFMT_NB_NF:
- break;
- }
-
- /* DAI clock master masks */
- switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
- case SND_SOC_DAIFMT_CBM_CFM:
- break;
- default:
- /* Master mode not implemented, needs handling of clocks. */
- return -EINVAL;
- }
-
- strcr |= SSI_STCR_TFEN0;
-
- if (ssi->flags & IMX_SSI_NET)
- scr |= SSI_SCR_NET;
- if (ssi->flags & IMX_SSI_SYN)
- scr |= SSI_SCR_SYN;
-
- writel(strcr, ssi->base + SSI_STCR);
- writel(strcr, ssi->base + SSI_SRCR);
- writel(scr, ssi->base + SSI_SCR);
-
- return 0;
-}
-
-/*
- * SSI system clock configuration.
- * Should only be called when port is inactive (i.e. SSIEN = 0).
- */
-static int imx_ssi_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
- int clk_id, unsigned int freq, int dir)
-{
- struct imx_ssi *ssi = snd_soc_dai_get_drvdata(cpu_dai);
- u32 scr;
-
- scr = readl(ssi->base + SSI_SCR);
-
- switch (clk_id) {
- case IMX_SSP_SYS_CLK:
- if (dir == SND_SOC_CLOCK_OUT)
- scr |= SSI_SCR_SYS_CLK_EN;
- else
- scr &= ~SSI_SCR_SYS_CLK_EN;
- break;
- default:
- return -EINVAL;
- }
-
- writel(scr, ssi->base + SSI_SCR);
-
- return 0;
-}
-
-/*
- * SSI Clock dividers
- * Should only be called when port is inactive (i.e. SSIEN = 0).
- */
-static int imx_ssi_set_dai_clkdiv(struct snd_soc_dai *cpu_dai,
- int div_id, int div)
-{
- struct imx_ssi *ssi = snd_soc_dai_get_drvdata(cpu_dai);
- u32 stccr, srccr;
-
- stccr = readl(ssi->base + SSI_STCCR);
- srccr = readl(ssi->base + SSI_SRCCR);
-
- switch (div_id) {
- case IMX_SSI_TX_DIV_2:
- stccr &= ~SSI_STCCR_DIV2;
- stccr |= div;
- break;
- case IMX_SSI_TX_DIV_PSR:
- stccr &= ~SSI_STCCR_PSR;
- stccr |= div;
- break;
- case IMX_SSI_TX_DIV_PM:
- stccr &= ~0xff;
- stccr |= SSI_STCCR_PM(div);
- break;
- case IMX_SSI_RX_DIV_2:
- stccr &= ~SSI_STCCR_DIV2;
- stccr |= div;
- break;
- case IMX_SSI_RX_DIV_PSR:
- stccr &= ~SSI_STCCR_PSR;
- stccr |= div;
- break;
- case IMX_SSI_RX_DIV_PM:
- stccr &= ~0xff;
- stccr |= SSI_STCCR_PM(div);
- break;
- default:
- return -EINVAL;
- }
-
- writel(stccr, ssi->base + SSI_STCCR);
- writel(srccr, ssi->base + SSI_SRCCR);
-
- return 0;
-}
-
-/*
- * Should only be called when port is inactive (i.e. SSIEN = 0),
- * although can be called multiple times by upper layers.
- */
-static int imx_ssi_hw_params(struct snd_pcm_substream *substream,
- struct snd_pcm_hw_params *params,
- struct snd_soc_dai *cpu_dai)
-{
- struct imx_ssi *ssi = snd_soc_dai_get_drvdata(cpu_dai);
- u32 reg, sccr;
-
- /* Tx/Rx config */
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- reg = SSI_STCCR;
- else
- reg = SSI_SRCCR;
-
- if (ssi->flags & IMX_SSI_SYN)
- reg = SSI_STCCR;
-
- sccr = readl(ssi->base + reg) & ~SSI_STCCR_WL_MASK;
-
- /* DAI data (word) size */
- switch (params_format(params)) {
- case SNDRV_PCM_FORMAT_S16_LE:
- sccr |= SSI_SRCCR_WL(16);
- break;
- case SNDRV_PCM_FORMAT_S20_3LE:
- sccr |= SSI_SRCCR_WL(20);
- break;
- case SNDRV_PCM_FORMAT_S24_LE:
- sccr |= SSI_SRCCR_WL(24);
- break;
- }
-
- writel(sccr, ssi->base + reg);
-
- return 0;
-}
-
-static int imx_ssi_trigger(struct snd_pcm_substream *substream, int cmd,
- struct snd_soc_dai *dai)
-{
- struct imx_ssi *ssi = snd_soc_dai_get_drvdata(dai);
- unsigned int sier_bits, sier;
- unsigned int scr;
-
- scr = readl(ssi->base + SSI_SCR);
- sier = readl(ssi->base + SSI_SIER);
-
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
- if (ssi->flags & IMX_SSI_DMA)
- sier_bits = SSI_SIER_TDMAE;
- else
- sier_bits = SSI_SIER_TIE | SSI_SIER_TFE0_EN;
- } else {
- if (ssi->flags & IMX_SSI_DMA)
- sier_bits = SSI_SIER_RDMAE;
- else
- sier_bits = SSI_SIER_RIE | SSI_SIER_RFF0_EN;
- }
-
- switch (cmd) {
- case SNDRV_PCM_TRIGGER_START:
- case SNDRV_PCM_TRIGGER_RESUME:
- case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- scr |= SSI_SCR_TE;
- else
- scr |= SSI_SCR_RE;
- sier |= sier_bits;
-
- scr |= SSI_SCR_SSIEN;
-
- break;
-
- case SNDRV_PCM_TRIGGER_STOP:
- case SNDRV_PCM_TRIGGER_SUSPEND:
- case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- scr &= ~SSI_SCR_TE;
- else
- scr &= ~SSI_SCR_RE;
- sier &= ~sier_bits;
-
- if (!(scr & (SSI_SCR_TE | SSI_SCR_RE)))
- scr &= ~SSI_SCR_SSIEN;
-
- break;
- default:
- return -EINVAL;
- }
-
- if (!(ssi->flags & IMX_SSI_USE_AC97))
- /* rx/tx are always enabled to access ac97 registers */
- writel(scr, ssi->base + SSI_SCR);
-
- writel(sier, ssi->base + SSI_SIER);
-
- return 0;
-}
-
-static const struct snd_soc_dai_ops imx_ssi_pcm_dai_ops = {
- .hw_params = imx_ssi_hw_params,
- .set_fmt = imx_ssi_set_dai_fmt,
- .set_clkdiv = imx_ssi_set_dai_clkdiv,
- .set_sysclk = imx_ssi_set_dai_sysclk,
- .set_tdm_slot = imx_ssi_set_dai_tdm_slot,
- .trigger = imx_ssi_trigger,
-};
-
-static int imx_ssi_dai_probe(struct snd_soc_dai *dai)
-{
- struct imx_ssi *ssi = dev_get_drvdata(dai->dev);
- uint32_t val;
-
- snd_soc_dai_set_drvdata(dai, ssi);
-
- val = SSI_SFCSR_TFWM0(ssi->dma_params_tx.maxburst) |
- SSI_SFCSR_RFWM0(ssi->dma_params_rx.maxburst);
- writel(val, ssi->base + SSI_SFCSR);
-
- /* Tx/Rx config */
- dai->playback_dma_data = &ssi->dma_params_tx;
- dai->capture_dma_data = &ssi->dma_params_rx;
-
- return 0;
-}
-
-static struct snd_soc_dai_driver imx_ssi_dai = {
- .probe = imx_ssi_dai_probe,
- .playback = {
- .channels_min = 1,
- .channels_max = 2,
- .rates = SNDRV_PCM_RATE_8000_96000,
- .formats = SNDRV_PCM_FMTBIT_S16_LE,
- },
- .capture = {
- .channels_min = 1,
- .channels_max = 2,
- .rates = SNDRV_PCM_RATE_8000_96000,
- .formats = SNDRV_PCM_FMTBIT_S16_LE,
- },
- .ops = &imx_ssi_pcm_dai_ops,
-};
-
-static struct snd_soc_dai_driver imx_ac97_dai = {
- .probe = imx_ssi_dai_probe,
- .playback = {
- .stream_name = "AC97 Playback",
- .channels_min = 2,
- .channels_max = 2,
- .rates = SNDRV_PCM_RATE_8000_48000,
- .formats = SNDRV_PCM_FMTBIT_S16_LE,
- },
- .capture = {
- .stream_name = "AC97 Capture",
- .channels_min = 2,
- .channels_max = 2,
- .rates = SNDRV_PCM_RATE_48000,
- .formats = SNDRV_PCM_FMTBIT_S16_LE,
- },
- .ops = &imx_ssi_pcm_dai_ops,
-};
-
-static const struct snd_soc_component_driver imx_component = {
- .name = DRV_NAME,
-};
-
-static void setup_channel_to_ac97(struct imx_ssi *imx_ssi)
-{
- void __iomem *base = imx_ssi->base;
-
- writel(0x0, base + SSI_SCR);
- writel(0x0, base + SSI_STCR);
- writel(0x0, base + SSI_SRCR);
-
- writel(SSI_SCR_SYN | SSI_SCR_NET, base + SSI_SCR);
-
- writel(SSI_SFCSR_RFWM0(8) |
- SSI_SFCSR_TFWM0(8) |
- SSI_SFCSR_RFWM1(8) |
- SSI_SFCSR_TFWM1(8), base + SSI_SFCSR);
-
- writel(SSI_STCCR_WL(16) | SSI_STCCR_DC(12), base + SSI_STCCR);
- writel(SSI_STCCR_WL(16) | SSI_STCCR_DC(12), base + SSI_SRCCR);
-
- writel(SSI_SCR_SYN | SSI_SCR_NET | SSI_SCR_SSIEN, base + SSI_SCR);
- writel(SSI_SOR_WAIT(3), base + SSI_SOR);
-
- writel(SSI_SCR_SYN | SSI_SCR_NET | SSI_SCR_SSIEN |
- SSI_SCR_TE | SSI_SCR_RE,
- base + SSI_SCR);
-
- writel(SSI_SACNT_DEFAULT, base + SSI_SACNT);
- writel(0xff, base + SSI_SACCDIS);
- writel(0x300, base + SSI_SACCEN);
-}
-
-static struct imx_ssi *ac97_ssi;
-
-static void imx_ssi_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
- unsigned short val)
-{
- struct imx_ssi *imx_ssi = ac97_ssi;
- void __iomem *base = imx_ssi->base;
- unsigned int lreg;
- unsigned int lval;
-
- if (reg > 0x7f)
- return;
-
- pr_debug("%s: 0x%02x 0x%04x\n", __func__, reg, val);
-
- lreg = reg << 12;
- writel(lreg, base + SSI_SACADD);
-
- lval = val << 4;
- writel(lval , base + SSI_SACDAT);
-
- writel(SSI_SACNT_DEFAULT | SSI_SACNT_WR, base + SSI_SACNT);
- udelay(100);
-}
-
-static unsigned short imx_ssi_ac97_read(struct snd_ac97 *ac97,
- unsigned short reg)
-{
- struct imx_ssi *imx_ssi = ac97_ssi;
- void __iomem *base = imx_ssi->base;
-
- unsigned short val = -1;
- unsigned int lreg;
-
- lreg = (reg & 0x7f) << 12 ;
- writel(lreg, base + SSI_SACADD);
- writel(SSI_SACNT_DEFAULT | SSI_SACNT_RD, base + SSI_SACNT);
-
- udelay(100);
-
- val = (readl(base + SSI_SACDAT) >> 4) & 0xffff;
-
- pr_debug("%s: 0x%02x 0x%04x\n", __func__, reg, val);
-
- return val;
-}
-
-static void imx_ssi_ac97_reset(struct snd_ac97 *ac97)
-{
- struct imx_ssi *imx_ssi = ac97_ssi;
-
- if (imx_ssi->ac97_reset)
- imx_ssi->ac97_reset(ac97);
- /* First read sometimes fails, do a dummy read */
- imx_ssi_ac97_read(ac97, 0);
-}
-
-static void imx_ssi_ac97_warm_reset(struct snd_ac97 *ac97)
-{
- struct imx_ssi *imx_ssi = ac97_ssi;
-
- if (imx_ssi->ac97_warm_reset)
- imx_ssi->ac97_warm_reset(ac97);
-
- /* First read sometimes fails, do a dummy read */
- imx_ssi_ac97_read(ac97, 0);
-}
-
-static struct snd_ac97_bus_ops imx_ssi_ac97_ops = {
- .read = imx_ssi_ac97_read,
- .write = imx_ssi_ac97_write,
- .reset = imx_ssi_ac97_reset,
- .warm_reset = imx_ssi_ac97_warm_reset
-};
-
-static int imx_ssi_probe(struct platform_device *pdev)
-{
- struct resource *res;
- struct imx_ssi *ssi;
- struct imx_ssi_platform_data *pdata = pdev->dev.platform_data;
- int ret = 0;
- struct snd_soc_dai_driver *dai;
-
- ssi = devm_kzalloc(&pdev->dev, sizeof(*ssi), GFP_KERNEL);
- if (!ssi)
- return -ENOMEM;
- dev_set_drvdata(&pdev->dev, ssi);
-
- if (pdata) {
- ssi->ac97_reset = pdata->ac97_reset;
- ssi->ac97_warm_reset = pdata->ac97_warm_reset;
- ssi->flags = pdata->flags;
- }
-
- ssi->irq = platform_get_irq(pdev, 0);
- if (ssi->irq < 0)
- return ssi->irq;
-
- ssi->clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(ssi->clk)) {
- ret = PTR_ERR(ssi->clk);
- dev_err(&pdev->dev, "Cannot get the clock: %d\n",
- ret);
- goto failed_clk;
- }
- ret = clk_prepare_enable(ssi->clk);
- if (ret)
- goto failed_clk;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- ssi->base = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(ssi->base)) {
- ret = PTR_ERR(ssi->base);
- goto failed_register;
- }
-
- if (ssi->flags & IMX_SSI_USE_AC97) {
- if (ac97_ssi) {
- dev_err(&pdev->dev, "AC'97 SSI already registered\n");
- ret = -EBUSY;
- goto failed_register;
- }
- ac97_ssi = ssi;
- setup_channel_to_ac97(ssi);
- dai = &imx_ac97_dai;
- } else
- dai = &imx_ssi_dai;
-
- writel(0x0, ssi->base + SSI_SIER);
-
- ssi->dma_params_rx.addr = res->start + SSI_SRX0;
- ssi->dma_params_tx.addr = res->start + SSI_STX0;
-
- ssi->dma_params_tx.maxburst = 6;
- ssi->dma_params_rx.maxburst = 4;
-
- ssi->dma_params_tx.filter_data = &ssi->filter_data_tx;
- ssi->dma_params_rx.filter_data = &ssi->filter_data_rx;
-
- res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx0");
- if (res) {
- imx_pcm_dma_params_init_data(&ssi->filter_data_tx, res->start,
- IMX_DMATYPE_SSI);
- }
-
- res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx0");
- if (res) {
- imx_pcm_dma_params_init_data(&ssi->filter_data_rx, res->start,
- IMX_DMATYPE_SSI);
- }
-
- platform_set_drvdata(pdev, ssi);
-
- ret = snd_soc_set_ac97_ops(&imx_ssi_ac97_ops);
- if (ret != 0) {
- dev_err(&pdev->dev, "Failed to set AC'97 ops: %d\n", ret);
- goto failed_register;
- }
-
- ret = snd_soc_register_component(&pdev->dev, &imx_component,
- dai, 1);
- if (ret) {
- dev_err(&pdev->dev, "register DAI failed\n");
- goto failed_register;
- }
-
- ssi->fiq_params.irq = ssi->irq;
- ssi->fiq_params.base = ssi->base;
- ssi->fiq_params.dma_params_rx = &ssi->dma_params_rx;
- ssi->fiq_params.dma_params_tx = &ssi->dma_params_tx;
-
- ssi->fiq_init = imx_pcm_fiq_init(pdev, &ssi->fiq_params);
- ssi->dma_init = imx_pcm_dma_init(pdev, IMX_SSI_DMABUF_SIZE);
-
- if (ssi->fiq_init && ssi->dma_init) {
- ret = ssi->fiq_init;
- goto failed_pcm;
- }
-
- return 0;
-
-failed_pcm:
- snd_soc_unregister_component(&pdev->dev);
-failed_register:
- clk_disable_unprepare(ssi->clk);
-failed_clk:
- snd_soc_set_ac97_ops(NULL);
-
- return ret;
-}
-
-static int imx_ssi_remove(struct platform_device *pdev)
-{
- struct imx_ssi *ssi = platform_get_drvdata(pdev);
-
- if (!ssi->fiq_init)
- imx_pcm_fiq_exit(pdev);
-
- snd_soc_unregister_component(&pdev->dev);
-
- if (ssi->flags & IMX_SSI_USE_AC97)
- ac97_ssi = NULL;
-
- clk_disable_unprepare(ssi->clk);
- snd_soc_set_ac97_ops(NULL);
-
- return 0;
-}
-
-static struct platform_driver imx_ssi_driver = {
- .probe = imx_ssi_probe,
- .remove = imx_ssi_remove,
-
- .driver = {
- .name = "imx-ssi",
- },
-};
-
-module_platform_driver(imx_ssi_driver);
-
-/* Module information */
-MODULE_AUTHOR("Sascha Hauer, <s.hauer@pengutronix.de>");
-MODULE_DESCRIPTION("i.MX I2S/ac97 SoC Interface");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:imx-ssi");
projects / platform / kernel / linux-starfive.git / commitdiff